kerPIQ {KEPTED}

Product-type Inverse-Quadratic (PIQ) kernel computation

Description

Computing the values of Product-type Inverse-Quadratic (PIQ) kernel functions.

Usage

kerPIQ(gamma, z1, z2)

Arguments

gamma

A number, the bandwidth parameter in the PIQ kernel.

z1

A vector, the first input of the PIQ kernel.

z2

A vector, the second input of the PIQ kernel.

Details

The Product-type Inverse-Quadratic (PIQ) kernel is defined as k(z1,z2)=Prod_j(1/(1+gamma*(z1_j-z2_j)^2)).

Value

A number, the value of the PIQ kernel function.

Examples

gamma=0.02
z1=c(3,1,3)
z2=c(8,1,9)
kerPIQ(gamma,z1,z2)